Inflated Male Mold covered with Concrete Anti Earthquake Giant Domes for Hull Build

Discussion in 'Boat Design' started by mtumut, Jun 8, 2016.

  1. mtumut
    Joined: Mar 2005
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    mtumut Junior Member

    Hello there,

    When you want to invest in a dome grain silo , you have a option to use male inflated mold covered with steel flexible rods and steel mesh and concrete.

    Its like pouring concrete on UNinflated balloon and than you would inflate it and the concrete gets the balloons shape.

    At 60s there were hippies built lots of domes with that technology.

    They say the pressure inside of balloon is equivalent of smoking pressure.

    I found excellent danish double ender plan at wooden boat and want to brain exercise with that technology.

    Umut
    Istanbul
     
  2. Kailani
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    Kailani Senior Member

    Too complicated to get an exact shape with no dips.
     
  3. gonzo
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    gonzo Senior Member

    Making a balloon of the right shape with the structural strength to support the tons of cement will be harder than building a boat with more conventional methods.
     
  4. Tiny Turnip
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    Tiny Turnip Senior Member

    Air supported structures work well when the radii of curvature are large and constant.
    the tighter the curves, the higher the pressures needed to support them.
     
  5. rwatson
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    rwatson Senior Member

    "steel flexible rods and steel mesh" - if you cant control the placement, the only other option, is over engineering, in order to make sure that the hull is strong enough.
    Boatbuilding is much more precise than lumpy emergency house contruction, House construction isnt all that weight sensitive, whereas boats are.
     
  6. Mr Efficiency
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    Mr Efficiency Senior Member

    The OP has got bored with the idea of taking a microboat out into a hurricane, apparently.
     
  7. SamSam
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    SamSam Senior Member

    A microboat escape is always on his mind.

    I built a few domes and the process wasn't to lay all that **** on a flat balloon and then inflate it. Think about it a little and it becomes obvious it won't work. It was to inflate the balloon structure and then spray two part expanding foam over it.

    The 60s hippies didn't build lots of those things and I never heard of one done with cement. The foaming equipment was a large commercial operation in itself, requiring money, equipment, experience and some other things most people living the life didn't possess.
     
  8. rwatson
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    rwatson Senior Member

  9. kerosene
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    kerosene Senior Member

    Mind you that all the photos of the homes are illustrations only. Hardly a proof of feasibility - even if quite interesting
     
  10. FAST FRED
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    FAST FRED Senior Member

    Most boaters want a smooth OUTSIDE .

    Concrete boats had a big hassle with weight.

    Although the promoters clained 9 lbs per sq foot , many were on the high side of 20lbs per sq foot of hull surface.

    Fine in a 90+ foot boat bit a disaster under 50-60 ft.
     
  11. Mr Efficiency
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    Mr Efficiency Senior Member

  12. SamSam
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    SamSam Senior Member

    Well, i would have never thought it possible but today I learned it certainly is.

    I liked the comment for this youtube




    Although I believe this particular one collapsed, there are others that have been around for a long time.

    https://failures.wikispaces.com/Binishell Domes

    .
     
  13. SamSam
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    SamSam Senior Member


  14. rwatson
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    rwatson Senior Member

    I have been in tow Binishells, one in a University in Victoria, and one in a shopping centre in Sydney.

    They were still standing, but like all monolithic concrete structures, normal cracking made waterproofing a problem.
     
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